1592 results about "Carbon disulfide" patented technology

An acid gas absorbent comprising a metal sulfonate, phosphonate or carboxylate of a hindered amine and a process for the selective removal Of H2S as well as other acidic components such as carbon disulfide, carbonyl sulfide and oxygen and sulfur derivatives of C1 to C4 hydrocarbons from mixtures containing such acidic components and CO2 using said absorbent.

The invention provides a process for the manufacture of carbon disulphide by reacting carbon monoxide with elemental sulphur to form carbonyl sulphide and disproportionating the carbonyl sulphide formed into carbon disulphide and carbon dioxide, the process comprising contacting a gaseous stream comprising carbon monoxide with a liquid elemental sulphur phase containing a solid catalyst at a temperature in the range of from 250 to 700° C. to obtain a gaseous phase comprising carbonyl sulphide, carbon disulphide and carbon dioxide. The invention further provides the use of a liquid stream comprising carbon disulphide, carbonyl sulphide and carbon dioxide obtainable by such process for enhanced oil recovery.

The invention belongs to the technical field of heavy metal wastewater treatment, and in particular relates to cyanuric acid-based heavy metal chelating flocculant and a preparation method thereof. In the method, cyanuric acid is adopted as a basic framework; and polyamine is connected to a molecule through epoxy chloropropane, and reacts with carbon disulfide in an alkaline condition to prepare the heavy metal chelating flocculant of which the molecule contains a plurality of branches and a plurality of dithio formate functional groups. The method overcomes the defects that the conventional monofunctional flocculant has small flocculating body, and poor precipitation performance, and when polymeric chelant chelates heavy metals, steric clash is great, and the residual heavy metal ion concentration is difficult to meet the standard and the like. The flocculant has the advantages of simple preparation process, mild condition, easy operation and control, high yield, high raw material utilization, less three waste discharge and environmental protection of technical process, convenient popularization and industrialization realization and suitability for treatment of various types of heavy metal wastewater, such as smelting wastewater, electroplating wastewater, nonferrous metals processing wastewater, mining and beneficiating wastewater, printed circuit board wastewater, battery plants and the like.

Decontamination formulations for neutralization of toxic industrial chemicals, and methods of making and using same. The formulations are effective for neutralizing malathion, hydrogen cyanide, sodium cyanide, butyl isocyanate, carbon disulfide, phosgene gas, capsaicin in commercial pepper spray, chlorine gas, anhydrous ammonia gas; and may be effective at neutralizing hydrogen sulfide, sulfur dioxide, formaldehyde, ethylene oxide, methyl bromide, boron trichloride, fluorine, tetraethyl pyrophosphate, phosphorous trichloride, arsine, and tungsten hexafluoride.

The specification discloses a process for the manufacture of carbon disulfide from sulfur dioxide and carbon monoxide comprising two catalytic reactions. In the first reaction, sulfur dioxide and carbon monoxide are converted to carbonyl sulfide and carbon dioxide. In the second reaction, carbonyl sulfide is disproportionated to carbon disulfide and carbon dioxide. The second reaction is conducted in the presence of a solvent, which continuously removes the carbon disulfide product so as to drive the reaction to completion.

The invention relates to an antibacterial and environment-friendly deodorant of microorganism strains and a preparation method thereof. The traditional method for removing odor generally uses essence to cover up the odor or pumping odor physically or uses ozone to oxidize and degrade the odor or uses a chemical method. The methods also can alleviate the odor to a certain extent, but finally the problem can not be solved really and fundamentally and the essence and chemical deodorization also have secondary pollution. The microbial deodorization technology utilizes the effects of high-efficient absorption, absorption and metabolism of particular microorganism strains which can convert or degrade odorant, to purify the odorous gases of amyl mercaptan, benzene methanethiol, methyl sulfide, ethanethiol, hydrogen sulfide, sulfur dioxide, p-benzyl mercaptan, ammonia, dimethylamine, trimethylamine and carbon disulfide and the like which are emitted from human life areas, domestic sewage and domestic garbage and the like and to convert the odorous components of amyl mercaptan, benzene methanethiol, methyl sulfide, ethanethiol, hydrogen sulfide, sulfur dioxide, p-benzyl mercaptan, ammonia, dimethylamine, trimethylamine and carbon disulfide and the like into matters without harm and odor, thus achieving the purpose of thoroughly improving air quality and protecting health of people. The preparation method utilizes a fermentation method of microorganism strains to prepare deodorant products.

The invention relates to amphiprotic high-molecule chelated flocculating agent for various heavy metal waste water treatments and preparation method thereof. The amphiprotic high-molecule chelated flocculating agent of the invention is formed by following steps: configuring a basic skeleton by cationic dimethyl diallyl ammonium chloride and acrylamide copolymer; reacting with aldehydes and polyamine through Mannich to connect the polyamine to the high-molecule chain; then reacting with carbon bisulfide in alkaline condition. The invention mainly overcomes the disadvantages that the existing high-molecule chelating agent has excessive flocs negative charge caused by the suspension of part chelating radical because the space steric resistance of high-molecule chain and chelated radical are not matched so as to reduce the flocculating settling performance and the traditional heavy metal waste water processing method has complicated technique, high cost, low efficiency and cannot be suitable for large-scaled heavy metal waste water treatment. The invention is widely applied to the heavy metal waste water treatment of various types, in particular suitable for removing the heavy metal ions in industrial waste water and domestic sewage.

The invention discloses a preparation method of a positive material for a lithium-sulfur battery. The preparation method comprises the steps of: (1) mixing elemental sulfur and an organic solvent uniformly so that the elemental sulfur is completely dissolved to obtain a sulfur-organic solution, wherein the organic solvent is selected from more than one of carbon disulfide, toluene, cyclohexane and normal octane; (2) adding a carbon material into the sulfur-organic solution, stirring uniformly, and removing the solvent to obtain a sulfur/carbon composite material, wherein the carbon material is selected from any more than one of active carbon, mesoporous carbon, carbon black, carbon nano tube and graphene or any more than one of active carbon, mesoporous carbon, carbon black, carbon nano tube and graphene which are acidified. According to the sulfur/carbon composite material, the carbon material with better electrical conductivity is coated on sulfur particles; compared with the pure elemental sulfur positive material, the first-time discharge specific capacity and the cycling performance of the sulfur/carbon composite material are effectively improved; and the preparation process is simple, the time is short, the energy consumption is low and the large-scale production is easy.

The present invention discloses one kind of chelating agent capable of treating several kinds of metal ion simultaneously. The chelating agent is synthesized with polyamine or polyethylene imine as basic skeleton and carbon disulfide in alkaline condition, where, polyamine or polyethylene imine and carbon disulfide have weight ratio of 1 to 0.6-2.0. The chelating agent of the present invention can form chelate precipitate simultaneously with several kinds of metal ion, and is especially suitable for use in purifying waste water, chemical intermediate and chemicals for printed circuit board containing metal ions.

A system comprising a carbon disulfide formulation storage; a mechanism for releasing at least a portion of the carbon disulfide formulation into a formation; and a mechanism for creating a pulse in the carbon disulfide formulation in the formation.

The invention provides an oil-soluble self-vulcanizing molybdenum catalyst, and a preparation method, a use method and an application of the oil-soluble self-vulcanizing molybdenum catalyst. The preparation method comprises the following steps of (1) sequentially putting a molybdenum source, water, sodium sulfide, a solvent and inorganic acid in a container under the protection of nitrogen, uniformly mixing and stirring, cooling to 5-50 DEG C for reaction for 10-150min, (2) adding alkylamine and carbon disulfide, uniformly stirring, heating to 60-200 DEG C for reaction for 3-10h, and (3) after reaction, sufficiently cooling a product, performing suction filtration, sufficiently washing with methanol, and drying to obtain the oil-soluble self-vulcanizing molybdenum catalyst. The oil-soluble self-vulcanizing molybdenum catalyst can be vulcanized and decomposed to form a molybdenum disulfide active component in situ, is used for a slurry reactor hydrocracking technology for poor heavy oil with a high metal content, a high carbon residue content and a high sulfur content, can reduce the coke yield, and keeps long-period operation of a device.

The invention relates to a gas line drag reduction agent and a preparation method thereof, relating to the technical field of the composite of high-molecular compound and piping systems. The drag reduction agent consists of carbon bisulfide, hydrazine hydrate and long chain acid, the mol ratio of which is 1.8:1:1 to 2.2:1:1. The preparation method comprises the following steps: step one, CS2 is taken according to proportional quantity, dripped into the mixed liquor of the hydrazine hydrate and water with proportional quantity under agitation, reflowed for certain time in the temperature range of 90 to 95 DEG C, then cooled for 30 to 60 minutes in ice water bath and pumped and filtered, the mother liquor continues to react for two times, products of the third time are merged, washed by using ethanol and ether sequentially, and recrystallized by using boiling water so as to obtain symmetrical diaminothiourea clear crystal; and step two, symmetrical diaminothiourea with proportional quantity and the long chain acid with proportional quantity are dissolved in a pyridine solvent with nitrogen protection, reflowed at the temperature of 140 to 220 DEG C by adopting a temperature programming method, and react for 3 to 4 hours, then the mixture is cooled to the room temperature and recrystallizated by using the ethanol of 95 percent to obtain the brown product.

The invention belongs to the technical field of removal, purification and entrapment of heavy metal ions in a water body, and in particular relates to an ethylenediamine-based heavy metal chelating agent and a preparation method thereof. The ethylenediamine-based heavy metal chelating agent is prepared by directly reacting ethylenediamine, carbon disulfide and solid alkali in absolute ethyl alcohol or a mixed solvent consisting of absolute ethyl alcohol and diethyl ether in a certain volume ratio. The method overcomes the defect of steric effect of polymer chains when the conventional polymeric chelating agent chelates the heavy metal ions, and also overcomes the defect that floccules have excessive negative charge to obstruct the further growth of the floccules because of mismatched space of chelation groups of small molecules with multiple functional groups. The product is solid powder, has high stability and is convenient to store and transport. The method has the advantages of simple synthetic process, mild reaction conditions, easy operation and control, high reaction speed, high efficiency, recyclable solvent, high utilization rate of raw materials, less discharge of three wastes, environmental-friendly technical process, conventional equipment and easy industrial production.

The invention relates to a method for preparing di-dithiocarbamate modified chitosan beads. The method comprises the following steps of: after dissolving 5 g of chitosan in an acetic acid solution at first, solidifying the chitosan in a sodium hydroxide solution to form chitosan beads with the diameter of 2-3 mm, wherein the solidifying time is 8-26 h; and, after carrying out Shiff alkali reaction, etherification, amination and elimination of benzaldehyde of the chitosan beads, grafting carbon disulfide under an alkaline condition to obtain di-dithiocarbamate modified chitosan. Compared with the original chitosan, the chitosan disclosed by the invention as a water treatment agent has stronger adsorption property and can be applied to treatment of heavy metal ions in wastewater, such as electroplating wastewater, battery wastewater, wastewater in mining industries and the like; the adsorption selectivity of the chitosan is increased; furthermore, the chitosan can be recycled for many times; and the purpose of rationally utilizing resources is achieved.

The invention relates to a method for preparing dithiocarbamate-based modified porous starch. The method comprises the steps that: using starch as the raw material; carrying out enzymolysis on the starch for 1 to 26 hours under the condition that the pH is between 4 and 6 and the temperature is between 30 and 60 DEG C by a complex enzyme consisting of a saccharifying enzyme and an alpha-amylase; drying the obtained product to prepare porous starch; and after carrying out crosslinking, etherification and aminating modification on the porous starch, grafting the product with carbon disulfide under the alkaling conndition to obtain the dithiocarbamate-based modified porous starch. Compared with the conventional porous starch, the dithiocarbamate-based modified porous starch of the invention has strong absorption characteristic and high adsorptive selectivity. When the adsorption effect is reduced, the dithiocarbamate-based modified porous starch is taken out and immersed in 2mol.L-1 of HNO3 solution to carry out desorption, the desorption ratio is over 90 percent, and the absorption effect is not reduced by repeated desorption. The invention has commendable economic and social benefits, and can be used for treatment of heavy metal ions in waste water in galvanization, battery and mining industries and the like.

The invention relates to a method for preparing an anode of a lithium sulfur battery, which comprises the following steps of: 1) pretreating a metal sheet: cutting the metal sheet with neat surface into a circular sheet, cleaning by using cotton balls absorbed with acetone, performing ultrasonic cleaning by using distilled water, taking out, and airing; and 2) preparing a carbon sulfur composite material: putting the treated metal sheet into a cavity of a sputtering device, carrying carbon disulfide vapor into the cavity by using sputtering gas, forming plasma by using the sputtering gas, sputtering high-purity graphic target by using the sputtering gas, depositing a carbon film on the pretreated metal sheet, decomposing the carbon disulfide vapor in the plasma formed by the sputtering gas, depositing the generated sulfur and carbon sulfur groups in the carbon film to realize sulfur doping, and preparing the carbon sulfur composite material through deposition, wherein the metal sheet on which the carbon sulfur composite material is deposited is the anode of the lithium sulfur battery. The preparation method is favorable for improving the cyclical stability of the battery, and can avoid reduction of conductivity of the anode caused by an adhesive and shorten the preparation period of the anode of the battery.

The invention discloses an oil solubility compound-type suspended bed hydrocracking catalyst, wherein the catalyst is prepared by the following steps: 1) enabling compounds of metal elements in the VIB family, the VIIB family or the VIII family in a periodic table of elements as metal sources with alkali metal sulfide or alkali metal hydrosulfide according to the mole ratio of (0.5 to 1)-(2 to 1), thereby obtaining a metal element compound at a reduction state; 2) adding the metal element compound at the reduction state and amine substances into a reaction medium according to the mole ratio of (1:0.6)-(1 to 2), and meanwhile dropwise adding carbon disulfide with the corresponding quantity into the reaction medium according to the mole ratio of (1 to 1)-(2 to1) with the metal element compound at the reduction state, warming to react at the reaction temperature of 30-110 DEG C for 2-10 hours; 3) filtering and washing the product obtained by the step 2) so as to obtain the oil solubility compound-type suspended bed hydrocracking catalyst. The catalyst prepared by the invention can inhibit the coke yield, and improve the light oil yield.

The invention discloses a preparation method of a magnetic fluorescence dual functional thermo-sensitive nano particle. The preparation method comprises the following steps: (1) preparing a nano particle core by a routine method, then packing the magnetic nano particle with a layer of silicon dioxide, performing cholromethylation on the silicon dioxide by utilizing a chloromethyl silane coupling agent, and leading benzyl chloride wrapped on the surface of the nano particle to react with carbon disulfide in the dimethylsulfoxide solution of potassium hydroxide so as to obtain a magnetic fluorescence nano particle the surface of which is modified with an RAFT reagent; and (2) utilizing the magnetic fluorescence nano particle obtained in step (1), a thermo-sensitive monomer, a sacrificed RAFT reagent and an initiating agent to form a polymerizing system and dissolving in solvent, carrying out reversible addition-fragmentation chain transfer (RAFT) living radical polymerization, and then performing separating to obtain the magnetic fluorescence dual functional thermo-sensitive nano particle with a nuclear shell structure. RAFT polymerization is directly carried out on the surface of the magnetic silicon oxide nano particle, thus facilitating the magnetic fluorescence dual functional nuclear shell structure to keep the stability of the structure and performance in the actual application process.

The invention relates to a method for preparing heavy metal chelating resin, in particular to a method for preparing silica gel supported dithiocarbamate heavy metal chelating resin and adsorption of heavy metals such as lead, cadmium, copper, mercury and the like by the resin. The method comprises the following steps of: reacting carbon disulfide with a polyamine compound to generate a dithiocarbamate compound; and grafting the dithiocarbamate compound onto the surface of silicon dioxide, wherein a halogen group is modified on the surface of the silicon dioxide. By the method, the adsorption capacity of dithiocarbamate chelating resin is effectively improved; and the problem that silica gel is dissolved due to too high alkalinity of a reaction system (pH value is more than 11), or the dithiocarbamate compound cannot be generated through reaction due to too low alkalinity (the pH value is less than 10) when a dithiocarbamate functional group is prepared by reacting the silica gel with the carbon disulfide in the conventional synthetic route is solved, wherein an amino group is modified on the surface of the silica gel.